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Intel has launched LGA 1156 structure around 1 year, and the CPU product line is also plenty.
If we divided into Chipset, P55 is mainly for Core i5-750/Core i7-860 and 870.
They are 4C/4T or 4C/8T structure, more CPU Cores, better performance and ATX form factor MB.
Another 2 chipset are H55/H57. H57 is not popular due to its high price.
H55 is mainly for All In One. The CPU built-in GPU is the new design.
Main CPU product line has Core i3-5X0/Core i5-6X0 2 series, and they are 2C/4T Cores mainly.

Of course, both series CPU can be installed with P55/H55.
But P55 has no VGA output function, you still need external VGA with Core i3-5X0/Core i5-6X0.
Core i5-750/Core i7-860、870 CPU donít built-in GPU. Even install in H55still need external VGA.
Users need to understand the LGA 1156 features you need to pay attention to.

Core i7-875K already has very high performance at default clock as with Turbo Boost OC technology.
As per CPU utilization rate, the clock will be in between 2.93~3.60GHz. It should be affordable for most application.

Sandra Memory Bandwidth - 19460 MB/s
EVEREST Memory Read - 14717 MB/s

Even though LGA 1156 has dual channel structure, not like as triple channel in LGA 1366, so the DDR3 bandwidth is lower.
Core i7 CPU built-in Memory Controller design makes LGA1156 DDR3 bandwidth be higher than dual channel PC platform over 1.5 times more.

3D gaming performance is relied on VGA capability.
However, the higher performance CPU can enhance 3D performance around 10-20%.
Core i7-875K performance is quite high standard, so when you use with ATI HD5380 for better 3D.

Temperature
Stnadby - 37~40

CPU Full Load - 53~59
Intel Burn Test v2.4，Stress Level Maximum

Under room temperature is 28℃, CPU full speed is still lower than 60℃.
For 4C/8T spec, Core i7-875K temperature is very good.

FDEBENCH test result is 327.6 Mb/s for reading and 89.8 MB/s for writing.

X25-V 40GB spec is lower performance than X25-M 80GB, reading 250 MB/s and writing 70 MB/s.
However, I recommend users can buy X25-V 40GB for RAID 0. The cost is similar and the RAID0 capacity is 80GB also.
Also, X25-V RAID 0 performance can reach over 320~350 MB/s for reading and writing is similar with X25-M, is above 80 MB/s.
This combo is better than buy just one X25-M 80GB. 4K, writing performance, is also the special strength of Intel SSD.

OC Performance
First of all, you can refer to my BIOS fine tune set up for 200/2000
BIOS Main page

Voltage setup page
CPU Feature
If you want to pull high CPU/DRAM frequency, you need to fine tune QPI/Vtt Voltage base on each CPU capability.
If you enable Hyper-Threading to let CPU be 4C/8T, the CPU Voltage also depends on its capability.
During test, Core i7-875K OC voltage is very well.
200/2000 at 4.2GHz only need QPI/Vtt Voltage 1.210V and CPU Vcore 1.3000~1.32500V to be stable for all test.

Even if you pull the CPU voltage, CPU clock still can be higher but may not be able to pass the burning test and cannot use for long time.
I prefer to OC the system under air cooling and can be stable. It will be more useful for most users.

Intel Core i7-875K current price is around 11700NTD, about 363USD.
The previous top LGA 1156 is Core i7-870 and the price is 19000NTD, around 589USD.
The channel has off shelf the Core i7-870 and replace by 875K which is higher C/P value.
You can see Intel top LGA 1156 CPU price drop to let user pay less for buying.

The price of 875K and 860 are very close.
875K is also unlock, so the C/P is not lower than 860.
If you are planning to buy Core i7-860, you can also consider Core i7-875K.

Most user worry about the OC needs to have good capability of MB and DDR3, so they give up in the beginning.
The unlock 875K make OC be easier. The user only need to set the ratio and voltage.
I do hope Intel can have more SKU than 875K/655K. They also can consider to have more entry LGA 1156 CPU for choosing. :)